Remove HTMLOutputElementCustom which is no longer needed.

Source/WebCore/bindings/dart/custom/DartHTMLCollectionCustom.cpp

Index: Source/WebCore/bindings/dart/custom/DartHTMLCollectionCustom.cpp
diff --git a/Source/WebCore/bindings/dart/custom/DartHTMLCollectionCustom.cpp b/Source/WebCore/bindings/dart/custom/DartHTMLCollectionCustom.cpp
index fa5231a447498e2ba9ac4afd22d36db51c0edb74..e1bb3da8177925530ea93fbe3ee31616edd5f423 100644
--- a/Source/WebCore/bindings/dart/custom/DartHTMLCollectionCustom.cpp
+++ b/Source/WebCore/bindings/dart/custom/DartHTMLCollectionCustom.cpp
@@ -39,36 +39,6 @@
 
 namespace WebCore {
 
-namespace DartHTMLCollectionInternal {
-
-// This method is custom in JavaScript.
-void itemCallback(Dart_NativeArguments args)
-{
-    DartApiScope dartApiScope;
-    Dart_Handle exception = 0;
-    {
-        HTMLCollection* receiver = DartDOMWrapper::receiver<HTMLCollection>(args);
-        unsigned index = DartUtilities::dartToUnsigned(Dart_GetNativeArgument(args, 1), exception);
-        if (exception)
-            goto fail;
-
-        DartDOMWrapper::returnValue<DartNode>(args, receiver->item(index));
-        return;
-    }
-
-fail:
-    Dart_ThrowException(exception);
-    ASSERT_NOT_REACHED();
-}
-
-void namedItemCallback(Dart_NativeArguments)
-{
-    // FIXME: proper implementation.
-    DART_UNIMPLEMENTED();
-}
-
-}
-
 Dart_Handle DartHTMLCollection::toDart(HTMLCollection* collection)
 {
     if (!collection)